William bkanagan



IMPROVEMENT IN STEAM GISIITERATORSI WILLIAM BRANAGAN, 0F BURLINGTON, IOWA. Letters Patent 1Y0. 59,952, d ateol *November 27, 1866.

SPECIFICATION.

TO ALL WIIOM IT MAY CONCERN t Be it known that I, WILLIAM BRANAGAN, of Burlington, in the county of4 Des Moines, and State of Iowa, have invented a newY and improved Horizontal Boiler; and I do hereby declare that the following'is a'full, clear, and exact description thereof, reference .being had-to' the accompanying draw-ingswmaking a part of this. specification, in which-4- i i Figure 1 is a perspective view of a horizontal boiler constructed upon my improved plan.

Figure 2 is aside elevation of `my boiler. y A

Figure 3 is a front end view of .the same.

I Figure 4 is a longitudinal section taken in' a vertical plane through the -outer `shell of the'boiler, 'exposing the inner shell. i i

Figure 5 is a transverse `vertical section.

Similar letters oimreference indicate corresponding parts in the several gures.

This invention relates to certain improvements on locomotive and stationary horizontal steam boilers, and

has for its object vso constructing a lboiler of this class, .that in a 'given size of boiler there ,shall be a greater` amount of steam spacethan is attainable with boilers having cylindrical outer and inner4 shells;` and also,.so

that there shall be tubes passing transversely, Vand in a horizontal drectiomthrough the .lire chamber' and form ing communications at each end Vwith the body of Water in the boiler for the purpose of i affording `increasedheating surface, as will be hereinafter described. v V i .To enable others skilled in the art to understand my invention, will describe its construction and operation. In the accompanying drawings, A represents the` outer shell of the boiler, which is of an' elliptical shape when -talren in cross-section at any point from front -to rear. The transverse shape of this shell is shown clearly in g. 5 wherein it will be seen that the top and bottom portions of the shellare semicii'cular, and that the sides are flat. 'The longest axis of the ellipse is in a vertical plane. Within the shell, is placed the inner shell, B, which in cross-section is of the same shape as the shell which encloses it. This inner shell, B, constitutes the fire box and ue, and is so 'arranged and supported that it forms a water space, a,o'f an equalsize below the horizontal plane, b, that is to say, the distance between the two shells, A. B, below the plane I: is equal. Above this plane, b, the space gradually increases and forms the steam space which is above the line, z z, indi eating 4the lowest point of water level. This inner shell is supported and secured in'fposition` by means of stays or braces, c c, which are so constructed as not to form an obstruction to the free circulation of the water in the space a. The front end of the'inner cylinder is closed by means of a suitable cap or wall, through which openings are made for the introduction of fuel, and also for obtaining access to the ashfpit below the grate. I

have not represented a grate in the drawings, as any arrangement adapted to the' purpose may be used. I prefer to have the grate-,extend only as far back as the first line of transverse tubes yg, and arranged in a plane 'I below the. lowest series of tubes, so that the flame and heated products of combustion shall circulate freely above, V below, and between these tubes, on their passage to thesmoke-pipe E, at the rear end of the boiler; By reference l to figs. 4 and 5, it will be seen that I form transverse communications between the space a on each side of, ,the

innershell, B, by means of tubes g g above referred to. These tubes are exposed to the most intense heat of the lire, and being arranged within the fire chamber they absorb large quantities of -heatfwhich would otherwise be carried oli'. These tubes, g g, not only serve as water conduits through there chamber in horizontal planes, but they'also serveas braces-or struts for strengthening the sides of theinner shell. By having the tubes arranged in horizontal lines, or in planes at right angles to the longest Vaxis'of the outer and inner shells, they will be uniformly subjected to the heat, and they, can also 'be cleaned or repaired when necessary, by forming` openings through the sides of the outer shell, as shown in tig. 5, through which openings access can be had to* the ends of the tubes. The said openings extend along the sides of the boiler as far as the tubes g are arranged,

and are `closed by means of caps, G G, which are secured steam-tight to their shell in any sui-table manner which will admit of their removal at pleasure.

What I claim as my invention, and desire to secure by Letters Patent, is

The construction of a 'steam boiler of an elliptical outer shell A andelliptical inner sh'ell B, horizontal transverse communications gand a removable portion or portions Gr, on the side or sides` of the'outer shell, all

arrangedv substantially as described and for the purpose set forth. l

W itness my hand in `the matter of my improved locomotive boiler fire box, this 25th day 'of vJ'uly1-866.

' VWILLIAM BRANAGAN.

Witnesses: A

HENRY H. SCOTT, HENRY J. Jsnvis. 

